gregg: high stakes in the mile high city. the candidates gearing up for the first presidential debate tomorrow night in denver. welcome to the second hour of "happening now," i'm gregg jarrett. jenna: and i'm jenna lee. a big night for really all americans tomorrow night, hopefully, you're ready for the big event as voters look forward to finally seeing both candidates on the same stage at the same time and hear what they have to say to one another and to us, right? governor mitt romney is hoping to turn turn the tide with a topnotch performance, turning the tide meaning we've seen the polls moving in the direction of the president. so just weeks before the election, this is so important for both candidates. mitt romney's already in denver, he's getting ready for tomorrow's big faceoff as folks in denver get ready for, really, a nightmare traffic situation. major highway is set to shut down during the debate, right in the middle of rush hour traffic. parking at the university of denver also a huge challenge, drivers there are